Yellow monoazo dyestuff.



UNITED STATES r rnntr @FFICE.

WILHELM HERZBERG, OF BERLIN, ANDilllfllN Rl bll OSTE it, 011 (111A ItIM'lYlENBURG, GERMANY, 'ASSIGNORS TO AOTIEN GESELLSOIBKFT FUR ANlLIN FABRIKATION, OF BERLIN, GER- MANY.

YELLOW MONO AZO DYE STUFF.

No. scones.

Patented Dec. 8, 1908.

Application filed June 3, 1908. Serial No. 86,450.

To all whom it may concem:

Be it known that we, *l VILHELM .l-lnnznsiio and HEINRICH Os'reh, citizens ol the Gcrnian Empire, residing at Berlin and Clnnzlottenburg 2, near Berlin,respectively, and whose post-ofiice addresses are, respeetively, Berlin, Hagelsbergerstrasse 10 c., and Chorlottenbnrg 2, near Berlin, Guerickestrasse 14, Germany, have invented certain new and useful Improvements in New Yellow llonoazo Dyestuffs, of which the following is a specification.

i'e have found that very valuable 1110110; azo-dyestull's can be obtained by diozotizing and tl'lGll\C()lIll)iillllg a chloro-derivntive of anilin', such as a mono or poly-chloroanilin with 1.3 phenylcnediainin 2.5 acid; the Coloring matters thus produced dye wool and silk-without a mordant from an acid. bath (sulfuric acid) clear and intense yellow shades, which are fast to acids and nllcalies and to light.

As to the "1.3-phenylenediamin-2.5-disalfonic acid this acid may be obtained by acting with sodium-sulfite on the 1.3dinitr,o 2-chlorobenzene-5-sultonic acid and reducing the 1.3 dinitrobenzcne 2.5 disull'onic acid thus obtained.

The following example serves to illustrate our invention: 127 arts of ortho-chloroanilin are diazotized in the usual manner by means of 69 arts of sodium nitrite and 285 parts of hytroohloric acid (20-2l $136.). 'lh diazo solution thus obtained is introduc. it hile stirring well into an aqueous solution of 1.3 phonylenedianiin disullonic acid; the combination occurs at once, the dyestufl', seporatin to a great extent from the solution. hen the reaction is finished, the mess is heated to the boil, the dyestuil thus bein dissolved, whercni'tcr from the hot solution the product is separated by adding common salt and is thus obtained in the shape of red crystals. This dyestufi' dyes wool and silk from an acid bath (sulfuric acid) a clear and intense yellow shade which is fast to acids and alkalies and to light.

This new dyestu'li as above so arated from the combination forms when pu vcrized a red powder, dissolving in water to a yellow solution, which solution on addition of some concentrated hydrochloric acid becomes a little niorcgeddishend which solution is not disulfon-ic altered onthe addition of some concentrated soda-lye. alcohol to a yellow solution and in concentrated sulfuric acid to a. red solution, which when diluted with ice separates red flakes.

By the action of strong reducing agents-the dyestuli is split up, ortho-chloroanilin besides triamidobenzenc disulfonic acid re sulting.

T If for the ortho-chloroanilin used in' the foregoing example another monochloro2milin, a dichloroonilin or another polychloroanilin is substituted dyestuffs of similar properties are obtained.

It is obvious to those skilled in the art that when using other monoor polychloroderivatives of enilin as parent material to be diztzotized and to be combined with the 1.3 phenylenediamin 2.5 disulfonic acid the conditions for diazotizction and .combination may be altered, such as the special cherscter of the ingredients and of'the product to be manufoctured'will require in order to obtain the best results.

the manner in which it may be performed what we claim is,

1. As new articles of manufacture the monoazo-dyestuil's which can be obtained and combining the diam-compound thus ob tained with 1.3-phenylenedmmin-2.5-disult'onic acid, which dyestull's produce on wool and silk without a mordant from an acid bath clear and intense yellow shades which are fast to acids and alkalies and to light, and which coloring nmtters form when to it yellow solution, in concentrated sulfuric acid toa red solution and in alcohol to o. yellow solution, and which new dyestuffs by the action of strong reducing agents are split up trio.inidobenZene-disulfonic acid.

2. As a new article of manufacture the monoazo-dyestull's which can be obtained by diezotizing ortho-chloroanilin and combining the diam-compound thus obtained with 1.3 phenylenedmmin 2.5 disulfonic acid, which dycstutl produces on wool and silk without a mordont from on acid both clear and intense yellow shades which are i'est to acids and alkalies and to light, and which coloring matter forms when pulverby diazotizing e chloro'derivative of anilin.

yielding a chloro-derivotive of anilin besides The dyestull' also dissolves in.

Having now described our invention and pulverized red powders, dissolving in Walter ized a red powder, dissolving in water to a chloroenilin besides triarnidobenzene-disuL yellow solution which on the addition of l ionic acid.

some concentrated hydrochloric acid be- In testimony whereof We have hereunto comes a little more reddish, and which soluset our hands in presence of two subscribing 15 yellow solution, and which dyestu'li by the HENRY HASPER, action of strong reducing'agents yields ortho- WOLDEMAR HAUPT.

tion is not altered by the addition oi some I witnesses.

concentrated soda-lye, this dyestuff dissolving in concentrated sulfuric acid to a red solution, which when diluted with ice separates red flakes, and dissolving in alcohol to a J Witnesses: 

